This animation shows the Spring retreat and subsequent Autumn advance of sea ice over the Arctic from 1/1/2005 through 12/31/2005. The false color of the sea ice, derived from the AMSR-E 6.25 km brightness temperature, was designed to highlight the fissures in the sea ice. Moving 3-day minimum brightness temperatures provide a background for smooth ice movement over which the actual daily brightness temperatures were mapped for definition of the ice structures. The sea ice extent was defined by a 3-day moving average of the AMSR-E 12.5 km sea ice concentration, showing as ice all areas having a sea ice concentration greater than 15%. Note: This animation shows the motion of the sea ice over the Arctic from 1/1/2005 through 12/31/2005. Data Collected: 1/1/2005 through 12/31/2005. Animator: Cindy Starr (GST). Scientist: Waleed Abdalati (NASA/HQ). Platforms/Sensors/Data Sets: Aqua/AMSR-E, Aqua/AMSR-E/Daily L3 6.25 km 89 GHz Brightness Temperature (Tb), Aqua/AMSR-E/Daily L3 12.5km Tb, Sea Ice Concentration, and Snow Depth.